Do you use the same pipe for drainage and toilets in the city?

Domestic sewage (toilets, kitchens) is discharged into the municipal drainage system after decay and precipitation in septic tanks.

Generally, the urban rain drainage system and domestic sewage discharge are separated, the rain drainage is directly discharged into the environment, and the domestic sewage is discharged into the large ring net after being treated by the purification plant.

Smaller second- and third-tier cities don't pay so much attention to it, and most of the ones I've seen are all connected with one tube...

Unlike ordinary domestic sewage, which has not been treated

The sewage of the toilet is first purified by the septic tank of the community and then discharged.

Sewage pipes are not the same as ordinary storm water pipes.

The developers of those neighborhoods are reluctant to give you a few jumps of pipes, unless you buy a better house with a higher price, and it may be separated, but no one can say for sure, after all, the houses in the city are built differently, what do you say?

The sofa is right, it is handled separately, and I don't know how to deal with it in the end.